Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- `app/controllers/api/v1/statuses_controller.rb`:
  Conflict due to upstream adding a new parameter (with_rate_limit),
  too close to glitch-soc's own additional parameter (content_type).
  Added upstream's parameter.
- `app/services/post_status_service.rb`:
  Conflict due to upstream adding a new parameter (rate_limit),
  too close to glitch-soc's own additional parameter (content_type).
  Added upstream's parameter.
- `app/views/settings/preferences/appearance/show.html.haml`:
  Conflict due to us not exposing theme settings here (as we have
  a different flavour/skin menu).
  Took upstream change, while still not exposing theme settings.
- `config/webpack/shared.js`:
  Coding style fixes for a part we have rewritten.
  Discarded upstream changes.

spec/controllers/api/v1/statuses_controller_spec.rb

@@ -39,12 +39,50 @@ RSpec.describe Api::V1::StatusesController, type: :controller do
     describe 'POST #create' do
       let(:scopes) { 'write:statuses' }
 
-      before do
-        post :create, params: { status: 'Hello world' }
+      context do
+        before do
+          post :create, params: { status: 'Hello world' }
+        end
+
+        it 'returns http success' do
+          expect(response).to have_http_status(200)
+        end
+
+        it 'returns rate limit headers' do
+          expect(response.headers['X-RateLimit-Limit']).to eq RateLimiter::FAMILIES[:statuses][:limit].to_s
+          expect(response.headers['X-RateLimit-Remaining']).to eq (RateLimiter::FAMILIES[:statuses][:limit] - 1).to_s
+        end
       end
 
-      it 'returns http success' do
-        expect(response).to have_http_status(200)
+      context 'with missing parameters' do
+        before do
+          post :create, params: {}
+        end
+
+        it 'returns http unprocessable entity' do
+          expect(response).to have_http_status(422)
+        end
+
+        it 'returns rate limit headers' do
+          expect(response.headers['X-RateLimit-Limit']).to eq RateLimiter::FAMILIES[:statuses][:limit].to_s
+        end
+      end
+
+      context 'when exceeding rate limit' do
+        before do
+          rate_limiter = RateLimiter.new(user.account, family: :statuses)
+          300.times { rate_limiter.record! }
+          post :create, params: { status: 'Hello world' }
+        end
+
+        it 'returns http too many requests' do
+          expect(response).to have_http_status(429)
+        end
+
+        it 'returns rate limit headers' do
+          expect(response.headers['X-RateLimit-Limit']).to eq RateLimiter::FAMILIES[:statuses][:limit].to_s
+          expect(response.headers['X-RateLimit-Remaining']).to eq '0'
+        end
       end
     end